Kix served as a medic in the 501st Legion of clone troopers. He is equipped with medpacs and other first aid equipment to help tend to his fellow squadmates in the thick of battle. Though Kix is dedicated to preserving the life of his fellow brothers, he has no qualms about fighting the enemy. Stencilled across his head is the phrase, "a good droid is a dead one" as testament to his mettle.
Though Rex outranks Kix in standard combat duty, when it comes to matters of health, Kix can countermand Rex's orders. When Rex was injured in the line of duty on Saleucami, Kix ordered him to stay put and recover.